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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-27 17:06:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-07-27 09:47:39 -0700 |
| commit | 333e71cfe2b3ca30ed1fb2d28510c542feb8379d (patch) | |
| tree | 823371327922183ddbd48739321d52b5c743c916 /kernel/sysctl_binary.c | |
| parent | 273e12926787a667f1581546e3cec7a1ec0415b6 (diff) | |
s390: fix test_fp_ctl inline assembly contraints
commit bcf4dd5f9ee096bd1510f838dd4750c35df4e38b upstream.
The test_fp_ctl function is used to test if a given value is a valid
floating-point control. The inline assembly in test_fp_ctl uses an
incorrect constraint for the 'orig_fpc' variable. If the compiler
chooses the same register for 'fpc' and 'orig_fpc' the test_fp_ctl()
function always returns true. This allows user space to trigger
kernel oopses with invalid floating-point control values on the
signal stack.
This problem has been introduced with git commit 4725c86055f5bbdcdf
"s390: fix save and restore of the floating-point-control register"
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/sysctl_binary.c')
0 files changed, 0 insertions, 0 deletions